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    Re: FW: Plexiglass horizon
    From: Bruce Stark
    Date: 2003 Jul 15, 12:39 EDT

    Meant to send this to the List, but apparently sent it directly to Ken:
    
    My six inch, model #98, Starrett level came with a card containing the
    following information:
    
    The main vial was ground. (there's also a small cross-level vial).
    
    Graduations on the main vial are at 1/10 inch intervals.
    
    A bubble movement of 1/10 inch indicates an elevation of .005 inches per
    foot.
    
    My experience is that it's easy to level to the half-division, or .0025 per
    foot.
    
    Bruce
    
    
    

       
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